I Am Considering Buying A Jack Russel Puppy, Any Advice On Training ?

I also have a 7 year old rescue greyhound (male) very good with most other dogs apart from large black black dogs. What would be the things to look out for training a jack russel. Also what to ask when buying one and what to do first when you first get them home, any specail advice. Thanks.

Training My Jack Russell/italian Greyhound

I am trying to train my dog to roll over and play dead, but she won’t follow the treat. It’s not a matter of if she likes the treat or not, she likes them. She just wont follow it! What do i do?!